Search found 358 matches

by mcauser
Thu Jan 24, 2019 4:06 am
Forum: General Discussion and Questions
Topic: Sensing sound from a speaker
Replies: 9
Views: 429

Re: Sensing sound from a speaker

Sensing sound from a speaker -> Sensing RF from a doorbell transmitter Your doorbell button is most likely a cheap ASK/OOK transmitter, operating on either 315 or 433.92 MHz. I recently made an ESP8266 based project which listens for RF packets emitted from my doorbell and urequest posts them to a ...
by mcauser
Thu Jan 24, 2019 3:56 am
Forum: General Discussion and Questions
Topic: Charging 3,7v LiPo battery
Replies: 6
Views: 331

Re: Charging 3,7v LiPo battery

Another option is to use one of those 18650 power bricks. https://www.aliexpress.com/item/2017-New-Portable-Power-Bank-18650-External-Backup-Battery-Charger-With-Key-Chain-Factory-Price/32828507666.html Consisting of a micro-usb for charging, usb-a for powering your device and comes in various prett...
by mcauser
Thu Jan 24, 2019 3:46 am
Forum: Programs, Libraries and Tools
Topic: Using rpi-rf with ESP 8266
Replies: 2
Views: 150

Re: Using rpi-rf with ESP 8266

Not to be confused with rpitx, which is a hack that can turn a raspberry pi into a crude transmitter using nothing more than a GPIO pin (and a bandpass filter).
by mcauser
Thu Jan 24, 2019 3:44 am
Forum: Programs, Libraries and Tools
Topic: Using rpi-rf with ESP 8266
Replies: 2
Views: 150

Re: Using rpi-rf with ESP 8266

I recently built an ESP8266 project using two of those cheap ASK/OOK modules and couldn't find any suitable libraries. There's a few raspi / arduino libraries which add their own protocols which you could use for inspiration. eg. rpi-rf, rc-switch, radiohead, etc. For TX, depending on the complexity...
by mcauser
Thu Jan 24, 2019 3:27 am
Forum: ESP8266 boards
Topic: HOW TO PROTECT THE CODE?
Replies: 2
Views: 542

Re: HOW TO PROTECT THE CODE?

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by mcauser
Thu Jan 24, 2019 3:12 am
Forum: ESP8266 boards
Topic: Working with ESP8266 (ESP-07S)
Replies: 1
Views: 160

Re: Working with ESP8266 (ESP-07S)

Should be the same ESP8266EX chip in all of the ESP-xxx modules. Some are configured with more flash memory. Some expose additional pins. Some have a metal can / shielding. See http://esp8266.net/ for more specifics. IPEX / U.FL connectors are only rated for a small number of reconnects. Maybe 20-30...
by mcauser
Thu Jan 24, 2019 3:01 am
Forum: ESP8266 boards
Topic: Lolin board erase everything from flash
Replies: 6
Views: 378

Re: Lolin board erase everything from flash

Could you add a few 5.5V super capacitors acting as a battery/ups and monitor the voltage on the analog pin and flick a relay to power down the device once the voltage drops below a threshold? The relay would be wired normally open, and you'd have to bypass it to boot, but once booted, hold it close...
by mcauser
Thu Jan 24, 2019 2:33 am
Forum: Drivers for External Components
Topic: Is there Ampy alternative?
Replies: 7
Views: 887

Re: Is there Ampy alternative?

I used to have a lot of intermittent problems using ampy with my esp8266s. Fixed by adding this line to my ~/.bash_profile: export AMPY_DELAY=0.5 Also, added this to save typing --port each time: export AMPY_PORT=/dev/tty.wchusbserial1420 And because my MacBook has multiple usb ports, I added aliase...
by mcauser
Fri Jan 11, 2019 3:05 am
Forum: Hardware Projects
Topic: small form factor STMF407 board
Replies: 6
Views: 445

Re: small form factor STMF407 board

Not yet, at least... If you're after tiny boards for your robots, would one of those BetaFlight STM32F405 based flight controller boards be suitable? They don't seem to break out many pins, but are very light and compact and often have useful components like EEPROMs and gyros/accelerometers. What ev...